/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.socket.sockjs.client;

import java.net.InetSocketAddress;
import java.net.URI;
import java.util.Collections;
import java.util.List;

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.util.concurrent.SettableListenableFuture;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketExtension;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.sockjs.transport.TransportType;

/**
 * An extension of {@link AbstractClientSockJsSession} for use with HTTP
 * transports simulating a WebSocket session.
 *
 * @author Rossen Stoyanchev
 * @since 4.1
 */
public class XhrClientSockJsSession extends AbstractClientSockJsSession {

    private final XhrTransport transport;
    private final URI sendUrl;
    private HttpHeaders headers;
    private HttpHeaders sendHeaders;
    private int textMessageSizeLimit = -1;

    private int binaryMessageSizeLimit = -1;


    public XhrClientSockJsSession(TransportRequest request, WebSocketHandler handler,
                                  XhrTransport transport, SettableListenableFuture<WebSocketSession> connectFuture) {

        super(request, handler, connectFuture);
        Assert.notNull(transport, "XhrTransport is required");
        this.transport = transport;
        this.headers = request.getHttpRequestHeaders();
        this.sendHeaders = new HttpHeaders();
        this.sendHeaders.putAll(this.headers);
        this.sendHeaders.setContentType(MediaType.APPLICATION_JSON);
        this.sendUrl = request.getSockJsUrlInfo().getTransportUrl(TransportType.XHR_SEND);
    }


    public HttpHeaders getHeaders() {
        return this.headers;
    }

    @Override
    public InetSocketAddress getLocalAddress() {
        return null;
    }

    @Override
    public InetSocketAddress getRemoteAddress() {
        URI uri = getUri();
        return (uri != null ? new InetSocketAddress(uri.getHost(), uri.getPort()) : null);
    }

    @Override
    public String getAcceptedProtocol() {
        return null;
    }

    @Override
    public int getTextMessageSizeLimit() {
        return this.textMessageSizeLimit;
    }

    @Override
    public void setTextMessageSizeLimit(int messageSizeLimit) {
        this.textMessageSizeLimit = messageSizeLimit;
    }

    @Override
    public int getBinaryMessageSizeLimit() {
        return this.binaryMessageSizeLimit;
    }

    @Override
    public void setBinaryMessageSizeLimit(int messageSizeLimit) {
        this.binaryMessageSizeLimit = -1;
    }

    @Override
    public List<WebSocketExtension> getExtensions() {
        return Collections.emptyList();
    }

    @Override
    protected void sendInternal(TextMessage message) {
        this.transport.executeSendRequest(this.sendUrl, this.sendHeaders, message);
    }

    @Override
    protected void disconnect(CloseStatus status) {
        // Nothing to do: XHR transports check if session is disconnected.
    }

}
